Brute force login credentials using Hydra. Services: ssh, ftp, http-get, http-post-form, etc. WARNING: Only test authorized systems.
AI agents invoke hydra_crack to trigger actions in Kali Linux Security Tools MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool executes active brute-force credential attacks against remote services. While technically 'Execute', the blast radius is critical: it can compromise authentication on SSH, FTP, and web services, potentially granting unauthorized access to entire systems. The warning 'Only test authorized systems' underscores the high potential for misuse.
From the tool's definition Brute force login credentials using Hydra. Services: ssh, ftp, http-get, http-post-form, etc.
Attacks that exploit this kind of access
Brute force login credentials using Hydra. Services: ssh, ftp, http-get, http-post-form, etc. WARNING: Only test authorized systems. It is categorised as a Execute tool in the Kali Linux Security Tools MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Kali Linux Security Tools MCP Server MCP server in PolicyLayer and add a rule for hydra_crack: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Kali Linux Security Tools MCP Server. Nothing to install.
hydra_crack is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the hydra_crack rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for hydra_crack. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
hydra_crack is provided by the Kali Linux Security Tools MCP Server MCP server (jesseeikeland/kali-linux-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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